Small hole well wall core sampler

Abstract

The invention discloses a small hole well wall core sampler. The small hole well wall core sampler is characterized by comprising a rotary short section, a circuit control short section, a coring assembly and a guide and orientation assembly, wherein one end of the circuit control short section is connected with a bridle through the rotary short section; the other end of the circuit control short section is connected with the coring assembly; the other end of the coring assembly is connected with the guide and orientation assembly; the guide and orientation assembly comprises a guide section which upwards resets and moves in a reciprocating mode and an orientation section for preventing the guide section from moving left and right and the core sampler from rotating in the axial direction; one end of the orientation section is connected with the coring assembly; the other end of the orientation section is connected with the guide section. The small hole well wall core sampler has the inner orientation and guide functions, ensures that the launching direction of a core barrel faces upwards all the time, can effectively reduce friction resistance generated by irregular well walls, is guided to operate along the track of a shaft, can effectively reduce shake generated in the operation process of the core sampler and the lunching process of the core barrel, can prolong the service life of equipment, and ensures the harvesting rate.

Description

technical field [0001] The invention belongs to the field of oil well wall coring, and in particular relates to a slim hole wall coring device. Background technique [0002] The borehole wall coring is determined by the logging data to determine the formation depth of the core to be taken, and the corer is lowered downhole with a cable. After reaching the predetermined depth, the downhole corer is controlled by the ground instrument to obtain the core from the borehole wall. The core is the intuitive primary data to obtain the formation lithology, physical property and oil-bearing property. Using this intuitive geological data can make a correct evaluation of the oil and gas layers in the exploration area, solve suspicious formations in the electrical logging data, and use borehole wall coring to reduce drilling coring, increase drilling speed, and reduce drilling costs. [0003] With the continuous deepening of science and technology in oilfield exploration and development...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a slim hole sidewall coring device to solve the problems of rapid acquisition of slim hole formation cores, use safety, and coring quality for wells less than 6 inches

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